Lennox Lewis, Tyson Fury, Wladimir and Vitali Klitschko, Riddick Bowe, Anthony Joshua, Frank Bruno, 90s Foreman there aren't any more worth mentioning, the other 2 are Valuev and Carnera
S-HW's have to be Giants - 6' 5" and taller. that is the mitigating factor... there are guys 6' 3" and 250lbs, but the Weight has no baring on a 3, 5 and 7 inch Height Disparity and an Equally Longer Reach to go with it. the Giants - S-HW, is HEIGHT, that is why they are a different animal / Division.
Wlad would be number 1 in terms of accomplishments. In terms of H2h it’s Wlad or Lennox. Then the rest. But Fury if he fought more often could make a case but I just don’t see it happening.